Molding machine



July 20 1926.

J. A. RATHBNE MOLDI NG MACHINE Filed oct. 19, 1925 Patented July `2?..0, 1926.

UNITED i STATES JOHN A. RATHBONE, OF DETROIT, MICH COMPANY, OF CLEVELAND, O

MoLnING Application filed October The invent-ion relates to molding machines of that type in which complementary patterns respectively above and below the mold iiask simultaneously operate to form corresponding prints. It has been found difficult to obtain proper definition in the print formed by the upper pattern Without ya relative movement of considerable velocity and it is also necessary to impart a final compression with considerable force. The present invention is designed to accomplish such re sults Without the use of compressed air and to this end the invention consists in the Y peculiar construction in. which the velocity is obtained by acceleration of gravity and the final compression` by the mass of the moving member.

In the drawings;

Figure l is a sectionalVV front elevation of a molding machineof my improved construction Figure 2 is a cross section therethrough.

A is the bed for supporting the lower pattern B, the mold flask C and sand frame D. E are posts or guides rising from the bed A and supporting at a considerable dis* tance above Vthe same a cross head F. Beneath this cross head F is a second cross head (if which is provided with bearings H slidably engaging the guides E. I is the upper pattern mounted on the cross head G and held in proper registration-With the lower pattern B. rllhe arrangement is such that when the cross head G is released it will drop by gravity and in so doing will acquire sufhcient velocity to cause the pattern l to form a sharp imprint iny the sand. Also. the mass of theV cross head G and pat'- tern carried thereby is calculated that after the first impact there Will be a steady pressure sufficient to obtain the requisite density in the sand body.

For operating the machine means must be provided for raising the cross head H and releasing the same. This may be accomplished in various Ways but as shown J is a revoluble shaft mounted in bearings in the cross head F and driven by ai pulley .K at one end thereof. L is a friction pulley mounted on the shaft J centrally between IGAN, ASSIGNOR TO RA'II-IBONE MACHINE H10, A CORPORATION OF OHIO.

MACHINE.. i

19, m25. seria; No. 63,410.

the guides E andl adapted to engage Wit-h an upwardly extending shank M on they cross head Gr. N isa presser roll for holding the shank M in frictional Contact Withthe pulley L, said roll being preferably supported on'.

the swinging link O and havingthe laterally extending operating arm vP which also serves to press the roll against Vthe shanin Thus, the revolution of the rshaft J and pulley L will frictionally drive the shank M in an upward direction lifting with it the cross head G and pattern I until further movement is preventedby the registration of a notch or cut away portion Q in the shankI with the friction pulley. The cross head Will then be retained in lifted position until pressure of the roll N is Withdrawn' by the lifting of the handle P. This will at once release the cross head permitting it to fall and to accelerate as before described.

It is obvious that various other mechanisms may be employed for lifting the cross head G but the essential feature is that the distance through which the cross head is permitted to fall and its mass or Weight should be so selected as to produce', first the required velocityffor securing good definition in the sand, and second,'the required force for the final y squeeze to obtain proper density.

Vilhat I claim as my invention is:

l. ln a molding machine, the combination with a mold iiask and a superposed pattern, of means fonimparting a predetermined relative velocity to ksaid 'members through gravity acceleration.

2. in amolding machine. the combination With a bed, a mold iiask ysupported thereon and a superposed pattern, of means for guiding said pattern permitting of" the lifting of the same a predetermined distance above said mold flask and lthen dropping whereby a predetermined velocity is acquired by gravity acceleration.

3. In a molding machinel` the combina!k 'f tion With a bed, a moldfiask supported thereon and a superposed pattern, means for guiding said pattern permitting of the lifting of the same a predetermined distance above said mold flask and 'means connected in Seid pattern and movable therewith for elimini f n predetermined mass.

ai. 1n a melding' machine. the combina ion with :1 lied und@ mold Heek Supported there-onr` or ai superposed pattern` means for :mi 1ing Suid Qntern in u Ye fini-a1 movement :ind foward@ Smid in'isk permitting 01" dropping the saine from a, predetermined heigilt snirienl, to obtain a. predetermined gravity acceleration and means connected 10 with Suid inttern for impm'ing u piedetermine-d Innes lio ihe 'falling' body.

In iestiniony whereof n'iiix niy Signature.

JOHN A. R-LlHBONE, 

